Dark interval heard in "Enter Sandman" and the "Simpsons" theme

• Musical term sometimes called the devil's interval
• A musical interval
• Three-note musical interval
• Interval known as "the devil in music" on account of its unsettling sound
• Interval of three whole steps
• Musical interval of three whole steps
• Three-whole-step interval
• Musical interval aka augmented fourth

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tritone \Tri"tone`\, n. [Gr. tri`tonos of three tones; tri- tri- + to`nos a tone.] (Mus.) A superfluous or augmented fourth. [R.]

Wikipedia Word definitions in Wikipedia
In music theory , the tritone is strictly defined as a musical interval composed of three adjacent whole tones . For instance, the interval from F up to the B above it (in short, F–B) is a tritone as it can be decomposed into the three adjacent whole tones ...